package com.yociyy.gate.config;

import lombok.AllArgsConstructor;
import org.springframework.cloud.gateway.config.GatewayProperties;
import org.springframework.cloud.gateway.route.RouteLocator;
import org.springframework.cloud.gateway.support.NameUtils;
import org.springframework.context.annotation.Primary;
import org.springframework.stereotype.Component;
import springfox.documentation.swagger.web.SwaggerResource;
import springfox.documentation.swagger.web.SwaggerResourcesProvider;

import java.util.ArrayList;
import java.util.List;

/**
 * swagger2配置类
 * 
 * @author Y.yang
 * @date 2020/6/1
 */
@Component
@AllArgsConstructor
@Primary
public class Swagger2Configuration implements SwaggerResourcesProvider {

	/** wagger的api json文档路径 */
	public static final String API_URI = "/v2/api-docs";

	/** 网关路由定位器 */
	private final RouteLocator routeLocator;

	/** 网关初始化配置类 */
	private final GatewayProperties gatewayProperties;

	@Override
	public List<SwaggerResource> get() {
		List<SwaggerResource> resources = new ArrayList<>();
		List<String> routes = new ArrayList<>();
		// 取出gateway的route
		routeLocator.getRoutes().subscribe(route -> routes.add(route.getId()));
		// 结合配置的route-路径(Path)，和route过滤，只获取有效的route节点
		gatewayProperties.getRoutes().stream()
				.filter(routeDefinition -> routes.contains(routeDefinition.getId()))
				.forEach(routeDefinition -> routeDefinition.getPredicates().stream()
						.filter(predicateDefinition -> ("Path").equalsIgnoreCase(predicateDefinition.getName()))
						.forEach(predicateDefinition -> resources.add(swaggerResource(routeDefinition.getId(),
								predicateDefinition.getArgs().get(NameUtils.GENERATED_NAME_PREFIX + "0")
										.replace("/**", API_URI)))));
		return resources;
	}

	/**
	 * 配置swagger资源对象
	 * 
	 * @param name 服务名
	 * @param location 服务路由
	 * @return 结果
	 */
	private SwaggerResource swaggerResource(String name, String location) {
		SwaggerResource swaggerResource = new SwaggerResource();
		swaggerResource.setName(name);
		swaggerResource.setLocation(location);
		swaggerResource.setSwaggerVersion("2.0");
		return swaggerResource;
	}
}